Striper Phil, My first suggestion would be to get rid of the sabotted bullets, and shoot nothing but POWER BELTS!! Sabboted bullets leave plastic fouling in the barrel, which CAN lead to poor shot placement. I own two different ML's,and all I shoot is the POWERBELTS. I guess it is your preference. Anyhow, another possibilty is the scope. I had a blackpowder scope on one of my guns, and couldn't get it to group. So, I bought a more expensive rifle scope, and have eliminated my zeroing problem. Can hammer tack's well beyond the 100yrd. mark!! Good Luck!!